To clog up someone's bathtub with toilet paper and take a shit in the tub then leave the hot shower running over it to humidify and make the fecal matter airborne
Someone shit steamed the frat house at St. Mary's College of Maryland
Describes a very boring person. One who is so lame, they would happily watch the vapour from freshly dumped excrement rather than have a life. An accountant maybe.
Dude 1: "So how's you new job? Good boss?"
Dude 2: "Total bummer man! The boss would watch shit steam rather than do anything useful!"